Voltage Level Detector (CB22135E)

We found this circuit in an English documentation from the 80's. Transistors are general-purpose types.

Automatic TV turn off (CB10090E)
This old circuit from a documentation from the 70s disconnects a TV from a signal obtained on the...
20 Wrms Transistor Amplifier (CB17226E)
This traditional complementary symmetry circuit provides 20 W of rms power at a load of 8 ohms...
Constant current source (CB21992E)
Using a CA3130 and a power transistor, this circuit can deliver a current of up to 500 mA with the...